DNV DNVGL-RP-E401 PDF

Ball valves

This RP specifies the recommended requirements for ball valves in piping systems with a size range of ½” to 24” and pressure ratings from ASME Class 150 to 2500. It does not cover subsea valves, instrument valves in tubing, actuator operated valves and control valves. Application in artic environment is excluded from this specification. No other geographical limitations apply.

The primary standard for valves in piping systems is API 6D and this present RP does not aim to replace API 6D. All recommended requirements are intended to be consistent with API 6D. Moreover this RP specifies additional requirements in order to reduce variations in valve specifications in offshore oil and gas projects.

This RP covers parameters related to ball valve design, material and testing as well as other valve details such as requirements to forging, anti-static device, blow-out proof stem and locking device.

Piping insulation

The current edition of this RP specifies the recommended requirements for piping insulation for offshore assets operated on the Norwegian Continental Shelf (NCS).

For piping insulation on the NCS, NORSOK R-004 is recognized as the industrial standard. It categorizes the piping insulation based on its purpose in nine (9) different insulation classes. NORSOK R-004 requirements address several aspects and parameters of the piping insulation, e.g. insulation material, jacketing material, qualification of personnel, pipe penetrations and inspection and test. This RP covers the proposed requirements for the insulation material. The range of nominal pipe sizes covered in this RP range from 2” to 36”.

Welded and clamped shoes

No geographical limitations apply for the recommended requirements to welded and clamped shoes.

This RP specifies the recommended requirements for shoes and clamps. A pipe shoe is a structure consisting of a saddle and integral base that is used to support the pipe by transmitting the load or forces to the adjacent structure. It can be divided into welded shoe and clamped shoe. Pipe clamp is installed to attach pipe to shoe structural members.